It was discussed long ago that csum_and_copy_from_user() performs
better than plain copy_from_user() on x86. I do not remember all
details, but I do know that using copy_from_user() is not a real
improvement at least on x86 architecture.
The rest of the changes (ie. the getfrag() logic to set
skb->ip_summed) looks fine.
This patch fixes the problem of x86 csum_partilal() routines which
can't handle odd addressed buffers.
I've sent Linus this fix already.
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